Workholding device



April 14, 1925.

1,533,089 H.- sf BERGEN `WGRKHOLDIIIG lDEVICE Filed sept. '26, .1921 2 sheets-sheet 1 Imm gime/ufo@ KERRY S. ERGE/z WORKHOLDING DEVICE Filed sept. 2e. 1921 2 sheets-sheet. 2

E. Il-

01 -HARRY 5. EERGa/z Patented Apr. 14, 1925. l

UNITED STATES HARRY S. BERGEN, OF TOLEDO, OHIO.

WORKHOLDING DEVICE.

Application filed September 26, 1.921.l Serial No. 503,198.

To all whom it may concern.'

Be it known that I, HARRY S. BERGEN, a citizen of the United States, residing at Toledo, in the county ot' Lucas and State of Ohio, have invented certain new and, useful Improvements in Torkholding Devices, of which the following is a speciiica-tion.

This invention relates to work holding devices, and particularly to means for holding castings in position while they are being machined.

One of the objects of the invention is to provide an improved device by means of which castings may be held in position by a plurality of clamps, the pressure of each of the clamps being substantially the same regardless of variations in the thickness of the parts of the casting engaged by the clamps.

Another object of the invention is to provide a work holding device having` a plurality of casting engaging clamps which may be simultaneously moved to Vclamping position by the operation of a hand Wheel. Y

Another object is to provide a workholding ldevice having an improved locating means which will properly position castings.

Still another object is to provide a device in which the clamping and locating means may be brought into operative engagement with the part to be machined by a quick and easy operation and in which rapid disengagement thereof is also permitted, thus saving a large part of the time now lost in removing the Iinished parts and positioning new parts in the lixture. n

Other ob] ects and advantages will be apparent from the follonfing description, in which reference is had to the accompanying drawings illustrating a preferred embodiment of my invention and wherein similar reference numerals designate similar parts throughout the several views.

In the drawings Figure l is a plan view of a work holding device embodying my invention, a substantially annular scale housing casting being shown as fixed in position thereon;

Figure Zis an enlarged elevational. View of the work holding device with a casting fixed in position thereon, parts ot' the device and the casting being shown in section.

Figure 3 is a vertical sectional view on a reduced scale showing a part of a device 'for locating a casting to be machined.

Although I have shown the device as adapted for use in machining a casting for a scale housing, it is to be understood that it has been so shown' for purposes of illustrationonly and that it is alsoV adapted for use with .castings ot'k other shapes, `as such changes in the form and location of the various parts of my device as are necessary to it it with castings of other shapes may be readily made by onev skilled in the art.

Referring to the drawings in detail, the base 1 of the work holding device is provided with suitable notches or 'slots' 2v to facilitatel its attachment to-a metal working Vmachine. Projecting upwardly from the base are three substantially eq-uidistant work supporting' members 3 upon which the casting C to be machined is positioned. The casting C is centrally located upon the fixture by means of the diametrically oppositely disposed lugs 4 and 5, the lug 4 having a rounded outer end adapted .to be received in afnotch in the casting, and the lug 5 having a notch adapted to receive a protuberance on the casting.y y Y' The lugs 4 and 5 are mounted respectively uponl radially movable members 6 and 7 located in grooved cover plates or guides 8 and 9 which are secured to the base 1. The innerends of the members 6 and 7 contact with the opposed'laces of a'wedging block 10, said block having substantially the shape of the frustum of a pyramid. The block 10 is integral with a vertically disposed shaft 11 that extends upwardly through a loosely fitted tube 12 which has a lower flange 13 resting upon thebase 1. The upper portion ot the shaftI 11 is threadethas at 14, to receive astarwheel A1li which is adapted to rest upon the upper end ofthe tube 12. v

lBy turning the star wheel 15 so as to draw the shaft 11 andthe block-10 upwardly, the tapered facesl of theblockare caused to exert wedging pressure upon the ends of the members 6 and 7 (see Figure 1) to forcethem outwardly, thus moving tlie'lugs 4 and 5 respectively into engagement with a notch 16 and a boss 17 upon Vthe casting C and thereby locating the casting upon the fixture. The members G and 7 are slidable in the grooved cover plates 8 and 9. When the star wheel 15 is rotated in the opposite direction the shaft 11 and wedging block 10 are pei'- mitted' to move downwardly, thus relieving the horizontal pressure onthe members' (i les and 7, :which ar'eithe'n withdrait(n` xfrom contact with tliecastin'gby the'retr'actilesprings 32, the inner' ends of which are pinned'or otherwise fastened to the cover plates Sand 9, while their outer extremities are fastened to the slidableine1nbers 6 and 7.

yThe casting C 1s held 1n rigid position ,up-

i on the vrwork holding fixture 'by im'e'ans`-fo`f a pluralitybof clamping bars or jaws Y18 pref-` erablylo ated so' las toe'nga'gelthe castiii'g in Y juxtaposition 1to the fsupprtin'g zmembers 3 so 'thatthe'liability VYof' springing" or warping vofthe casting willbe'lreduc'ed to a minimum.

` claims.

The clamping `Vbars 'l'Sar'e 'mounted upon pins rlQjwhich 'are vpositioned -in Vbosses 20, said bosses preferably' being' Vc "ast yiitegral withthebase '1, the bars lbeingprovid'ed with longitudinally extending slots 2l, so that they maybe moved radially out` of the wayor" the' casting'whileit is 4bc-in'g'placed upon lor Viemove'l from the fixture., The'inner fend's'of tliebars A18 'rest uponlthe upper surface of a disk 22' which is loosely mounted upon the fiangeQS projecting"fronr'al vertically disposed/sleeve 24, theengagi`1igi surfaces O the vflangeandI disk' b'ein'g spherical so that the diskis universallymounted up'on the flange and is therefore :free Vto wabble except as itis restrained 'by the pressure y wardly from thesleeveal into a 'vertical groove in the Y tube` 12 vpier/ents v`rotation of `the 'sleeve on Kthe-tube but permits the sleeve to move'vertically thereon. "From Vthe 4fore,going' de'psription is believed toy-be apparent that Lby `rotating the f' hand wheel 26 ina 'direction todraw lthe sleeve'Qfi upwardly the ,disk l22' is also moved upwardly, thus exerting an k upwardly 'acting i'orce upon the bars 18;theoppo'site'ends oi VVwhich are thereby forced downwardly upon the casting- C `so Vthat the 'casting isfrigidly held 1n place onthetixture. Sincelthe" disk 221s universally 'connected to'theisleeve-Q the clamping pressure equalizp'ed among vthe fbars 18l and the casting istightly'claniped against each of the work'sn'pporting members Sregardless of slight'variations infthe thickness of the casting.

'lVhile it will be'appaifent'thatthe illustrated vembodiment of my `inver'ition `"herein disclosedis well VYcalculated to :adequately fuliill the objects primarily stated, v it `to be understood that 'the invention is suscepti- Vble lto variation, modilication `I`and'"liange within thespirit and scope ofthe subjoinerd lHaving described my invention, I-` claim Y Ll. ln a `deviceoi theclass described, in combination7 a universally mounted membei?, a plurality of clamping' members engageable therewith, and means for movingl `s`aid 'universally mounted member whereby equalized force is simultaneously exerted upon'eachosaid clamping members.

2. In a device ofthe class deseribechrin combination, arectilinearly movable member, fan -`equaliZing member universally mounted "thereon, landl a 4plurality off clamping' Anfiembe'rs engageable with *said Iequalizing Imember.,

3. Ina device of the class ldescribed, `in

combination, Va. basefa plurality of lwork supporting members, a vplurality 'of lcla'mpingjmeinb'eis, and means rsimultaneously exertingl clamping 'membersk `said means comprising a rectilinearly mvablefnieiiibe'r, fa member univ equalized ypressure upon ,said

1'sally mountedtlireon-and adapted-to enfgagies'aid clamping' members,"andv means means formovingsaid thrustmemb'ers out-y wardly 'with ec'u'iali'ze'd'pressure. 4

5l Ina device of the'classgdescribed,in combination, a b'as'e, l"a plurali-ty of work supporting members a plurality of clamp# ingfinemb'ersgmeans for simultaneously exei'ting equalized f'pressure upon said vclamping members, said means vcomprisingla sleeve, f-'a diskllilie member universally mounted'thereon ande'nfgageable with said clamping members, and'means to move said -sleeve endwise. n Y (In aY device of thejclass described, 'in combinationyaIbase, aplurality offcla'm'pi g barsfpivotally mounted on"s`aid base, said bars being' movable `er'idwis'e .wl'ienvreli'ei'f'e'd from clamping force, and ymeans orsimulrtaneously exerting` equaliZ'ed olampingfforc'e Yon said bars. y n i 7, a device of :the vclass describ`e'd,. in combination, aIbase, a fplurality'f clampingv bars pivot'ally vmounted Yon v said zbase, said bars being inovable 'endwise 'wlienrelieved fromY clamping vforce;V and means -yfor isinniltanec'r'u'sly 'exertingequalized elamping f'to'rce on saidE bars,said means comprisinga universally mounted I E nemb'erf engageable withfsaid bars, fand means for' moving said tuniver'sally mounted member y"vifherebyj it is causedfto'exertpressureon saidbarsl 8. f[n va device' ofthe class described, in.

lso

combination, a base, Work locating4 means on said base, said work locating means comprising a pluralityV of thrust members, guides for said thrust members, a Wedging device, means for forcing said Wedging device into Wedging engagement with the ends of said thrust members and thereby forcing said thrust members into engagement with a part to be Worked, and resilient means for withdrawing said thrust members from engagement with such part.

9. ln a device of the class described, in combination, a base, Work locating means on said base, said Work locating means comprising a plurality of thrust members, guides for said thrust members, a tapered block, a shaft secured thereto, means for' imparting endwise movement to said shaft and thereby forcing said block into Wedg-V ing engagement with said thrust members, whereby said thrust members are forced into engagement with a part to be Worked, and resilient means for withdrawing said thrust members from engagement With such part.

l0. In a device of the class described, in combination, a base, Work locating means on said base, said Work locating means comprising a plurality of thrust members, guides for said thrust members, a Wedging device, means for forcing said Wedging device into Wedging engagement with the ends of said thrust members and thereby forcing said thrust members into engagement With a part to be Worked, resilient means for withdrawing said thrust members from engagement Withsuch part, ak

plurality of Work supporting members, a

plurality of clamping members, and means V' ends of said clamping bars, and means for moving said universally mounted member and thereby simultaneously exerting an equalized force in the same-'direction upon each of said clamping bars.

HARRY S. BERGEN. Witnesses: i

FRANCES Dormi, MILDRED ANGELL. 

